Off the shelf insoles (orthotics) are ready-made orthotics that offer some support to the arch of the foot and help distribute weight properly along the sole of the foot.
These inserts can usually be trimmed to fit your shoes and are desined to be used immediately. Although they are not made to your feet there are different types, some of whch may suit your specfic issue.
Bespoke insoles are custom-made to fit your foot and to alter the biomechanics of their action to reduce pain and discomfort.
To ensure these fit you precisely fitting them involves analysing how you walk and stand and taking a cast or scan of your feet. Sometimes semi bespoke orthotics can be a good middle option when we adapt special off the shelf designs.